Dipper tooth assembly



July 16, 1935. D. H. YOUNG 2,007,991

DIPPER TOOTH ASSEMBLY FiledApril 5, 1933 2 sheets-511661 1 Patented July 16, 1935 UNITED STATES PATENT oFFicE 2,007,991 DIPPER 'roo'rH ASSEMBLY Application April 5, 1933, serial No. 964,549

1 Claim.

This invention relates to improvements in dipper teeth and particularly to dipper teeth in which the points are replaceable and reversible with respect to the base portions of the teeth.

Various forms of dipper teeth designs have been proposed in which a dipper tooth point is pulled upon the base portion by a wedging pin. The point is customarily formed with a pair of rearwardly divergent jaws and it is necessary to prolO Vide a shank, or a pair of tangs rearwardly extending from the point and tting into the base for cooperation with the wedge pin. The dipper teeth in use are vsubject to heavy digging strains which tend to loosen the dipper points from the l5 bases or to distort the connecting portions so that loosening or breakage of the teeth finally occurs.

It is an object of the present invention to pro- Y vide in improved design in V which the connecting portion is so designed that, although heavy .digging strains may cause distortion of the forward portion of thepoint,'the connecting portions of the point and base will remain in tight engagement without distortion.

It is a particular object of my invention to disclose a construction in which a part of a dipper tooth is provided with a pair of separated attaching portions fitting into pockets formed in the other form of the tooth, the two parts being provided with tapered contacting surfaces whereby the attaching portions are wedged together the following description taken in connection with the attached drawings.

In the drawings:

Figure 1 is a plan view of the dipper tooth assembly;

Figure 2 is a side elevation; Figure 3 is a longitudinal section on the plane indicated 3--3 in Figure 1;

Figure 4 is a longitudinal section on the plane indicated 4--4 in Figure 2;

Figure 5 is a detail cross section on the plane indicated 5--5 in Figure 3;

Figure 6 is a detail section on the plane indicated 6 6 in Figure 3;

Figure 7 is a plan view of a modified construction;

Figure 8 is a side elevation; l

Figure 9 is a longitudinal section on the plane indicated 9 9 in Figure 7;

Figure 10 is a longitudinal section on the plane -indicated IU-lll in Figure 8, and

Figures 1l and l2 are detail sections on the planes indicated, respectively, Il -ll and I 2-l2 in Figure 8.

Referring rst of all to the form disclosed in Figures 1 to 6, inclusive, the dipper tooth assembly includes a base IU and a point I2, these parts being held together by a wedge pin I4. The base l0 includes rearwardly extending Shanks I6 and I8 for attachment of the base to the usual Iclipper front, which is received in the recess 20 between the Shanks. The base has forwardly convergent top and bottom walls 22 and 2li and vertical side Walls 26. The side walls have forwardly extending V-shaped cheeks 28. The base has a cored opening 3|) extending therethrough from the nose to the recess 28. The side walls 26 and the nibs 28 are tied together by a horizontal web 32 ex'- tending within the cored opening 30 and extending forwardly to the end of the cheeks 28, as shown at 3d in Figure 4. The forward portions 35 of the cheeks have tapered side faces 36 for cooperation with the point as will be later described. 'I'he inside faces of the cored opening 3D above and below the web 32 are tapered slightly rearwardly toward each other, as indicated at 38 in Figure 3. The upper part of the base 24 is cprovided with a slotted opening l0 extending into the cored opening 30 and the bottom face of the base is provi-ded with a slotted opening t2. These openings t0 and ft2, together with an opening 44 in the web 32 are tapered and adapted to receive the wedge pin it. As shown in Figure 3 the wedge pin, when in position, fits tightly against the forward sides of the openings 40, t2 and t4. yThe point l2, which is tted on the base, is formed with rearwardly divergent jaws t6 and is adapted to be mounted reversibly as well as replaceably upon the base. The jaws t6 are strengthened by partial side walls t8 whereby a pocket is formed to the portions 35 of the base. Rearwardly of the walls 48 however the point is open to abut against the cheeks 28 of the base, as shown clearly in Figure 2. The pocket in the point between the jaws t6 and the side walls 48 receives the web portion 32 of the base.

Integrally formed with and rearwardly extending from the jaws 36 are provided attaching tang portions 50 which are spread apart to t loosely over the web 32 on the base but have tapered outer faces adapted to tightly engage vthe inside tapered surfaces 38 of the base. The tangs 5D have tapered slotted openings 52 to receive the wedge pin I4 and in assembled position the wedge pin will be forced tightlyagainst the rear faces of the openings 52 as shown in Figure 3. Thus the point is assembled upon the base by movement longitudinally into position` whereupon the 'tangs 5|) will be pressed toward each other and driving 'the wedge pin into position will rigidly formed in the upper part of the base, opening M2 secure the point and base together since the point will he pulled more tightly into position by the action of the wedge pin.

In assembled position the wedge pin is seated against the base at three spaced faces and against the point at two spaced faces, therefore the wedge pin is under double shear. The sectional View of Figure 5 shows the manner in which the nose portion of the base, which is I-shaped in cross section at this point, fits closely within the pocket formed in the point. The sectional View of Figure 6 Qn' the other hand ilustrates the manner in which the tang portions 50 of the point nt tightly into theopenings formed in the base above and below the web 32.

in the modified construction disclosed in Figures '7 to l2, the base H0 and point ||2 are joined together bythe wedge pin H4. The base has attaching shank portions l|8||8 having a recess H20 therebetween adapted to receive the dipper front and a short web l2| between the Shanks is adapted to fit into a slot in the front wall. The top and bottom faces l22-i24 of the base taper forwardly toward each other. The base has vertical side walls |26. The side walls of the base have forwardly projecting V-shaped portions |28 adapted to cooperate with the point Ell@ as will be later described. The interior of the base portion is recessed to provide pockets i3@ separated by the horizontal web or tongue |32, which integrally connects the side walls. Ihe web E32 extends to the ends of the V-shaped portions t28 but is slotted or indented at its central portion as at |33, as clearly showndn Figure l0.

The side walls of the pocket |130 are tapered slightly rearwardly as indicated at |35, while the top and bottom walls of the pockets 30 respectively are tapered as'indicated |38. The wedge pin M4 is received in the slotted opening Mil in the lower part of the base and opening i144 in the web E32, whereby the wedge pin seats against the forward faces of the openings when the dipper tooth is assembled.

The point I i2 has rearwardly extending tapered jaws M6 which engage the tapered side walls |28 of the base. Rearwardly extending from the point and from between the jawsl |46 are a pair of attaching tangs H50 provided with openings |52 to receive the wedge pin, whereby the rear faces of the openings E52 seat against the wedge pin.

The tangs i511 have tapered walls cooperating with the interior tapered walls of the pockets l 30 in the base but the space between the tangs is somewhat wider than the thickness of the web 32 on the base whereby the tangs are free to be wedged together as the point is drawn upon the base thereby obtaining a tight engagement at the contacting surfaces |38. The strength of the point is materially increased by the provision of a shortconnecting web |54 as shown in Figure 10, This web |54 is narrower than the width of the tangs |50 and is illustrated in the sectional view of AFigure 11.

Thus, in this design, the divergent jaws of the point are prolonged into tapered extensions or tangs which are adapted to receive the wedge which holds the point and base in engagement. The base prevents the spreading of the jaws by contact withy the tapered outer surfaces of the jaw extensions or tangs. These tapered surfaces of the extensions are so arranged that if the point is pressed into engagement with the base a wdging action is obtained which causesv the jaws of the point to be held in close engagement with the forward end of the base. In order to prevent the forward end of the base from being unduly weakened, due to its bifurcated formation, it is provided with the lateral web |32 uniting the side portions and producing in effect an -beam section. This web |32 is indented as by the slot |33 to permit the provision of the short connecting web |54 between the divergent jaws of the point. The dimensions of this web |54 are such that each section of the point will have a greater resistance against the imposing bending strains than the moment of these strains at the section considered. This same consideration is true of the forward end of the base where the two side projecting portions are independent of one another only for such a distance as will produce sections of greater strength than the corresponding bending moments. The result of this assembly is that the point and the portion of the base which engages the same form a beam of greater than uniform strength forl the resistance of both vertical and lateral bending strains. It has been found in actual use that the forward or digging end of the point, if subjected to undue strain, will be distorted by bending without any corresponding distortion of the base or rear sections of the point.

i claim:

in a dipper tooth assembly, a point lhaving rearwardly divergent jaws, spaced side walls join- 'ing said jaws forming a pocketed crotch in said point, a pair of tangs rearwardly extending from said jaws, a base having spaced side walls adapted i thereof to receive the rear ends of said tangs and a wedge pin extending into said base through said web and through the rear ends of said tangs directly engaging said tangsffor forcing said point into tight engagement with said base.

DOI'MLD H. YGUNG. 

